How does a calorie (lower case "c") differ from a Calorie (upper case "C")?
a. One calorie equals 100 Calories.
b. One calorie equals 1000 Calories.
c. One Calorie equals 100 calories.
d. One Calorie equals 1000 calories.
e. They are the same.
ANSWER: d
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Which of the following is the correct sequence that describes the excitation and contraction of a skeletal muscle fiber?
1. Tropomyosin shifts and unblocks the cross-bridge binding sites. 2. Calcium is released and binds to the troponin complex. 3. Transverse tubules depolarize the sarcoplasmic reticulum. 4. The thin filaments are ratcheted across the thick filaments by the heads of the myosin molecules using energy from ATP. 5. An action potential in a motor neuron causes the axon to release acetylcholine, which depolarizes the muscle cell membrane. A) 1 ? 2 ? 3 ? 4 ? 5 B) 2 ? 1 ? 3 ? 5 ? 4 C) 2 ? 3 ? 4 ? 1 ? 5 D) 5 ? 3 ? 1 ? 2 ? 4 E) 5 ? 3 ? 2 ? 1 ? 4
After childbirth, ____ in the mother
a. oxytocin stimulates the production and secretion of milk b. oxytocin stimulates the production of milk and prolactin stimulates the secretion of milk c. prolactin stimulates the production and secretion of milk d. prolactin stimulates the production of milk and oxytocin stimulates the secretion of milk e. estrogen and progesterone are directly responsible for the production and secretion of milk
As filtrate moves down the loop of Henle, the surrounding interstitial fluid becomes _____ concentrated than the filtrate, so _____ leaves the filtrate.
Fill in the blank(s) with the appropriate word(s).
Dunaliella salina is a bacterium that is able to live in aqueous solutions with such high salt concentrations that the salt cannot fully dissolve. D. salina is an example of a(n)
A) extreme thermophile. B) extreme halophile. C) methanogen. D) proteobacteria.